S. L. Stach, A. W. Liao, M. de Lourdes Brizot, R. P. V. Francisco, and M. Zugaib, “ Maternal postpartum complications according to delivery mode in twin pregnancies ”, Clinics, vol. 69, no. 7, pp. 447–451, Jul. 2014, doi: 10.6061/clinics/2014(07)01.